Live rape should do a good job in the morning.

(Agricultural Wealth Network) With the expansion of winter rape area year by year, the proportion of direct seeding rape also increased. However, direct seeding rape sowing late, effective growth period shortened before winter, difficult to cultivate strong seedlings before winter, therefore, we must do a good job in seedling four early management.

The sowing quantity of rape direct seeding with fixed seedlings in the morning is relatively large, and the sowing is relatively late, especially the rape in the triple-cropping rice field, which is generally sown at the end of October. Due to improper management of thinning seedlings and fertilizer and water, the seedlings are crowded, resulting in line seedlings and weak seedlings. Therefore, the seedlings should be fixed at the time of 2~3 leaves of rape, 4~5 leaves, and the seedlings should be moved and diluted to ensure the whole seedlings. 12,000 ~ 15,000 seedlings shall be reserved per mu to make up for the shortage of late sowing with sufficient population. 50g of 15% paclobutrazol per mu and 50kg of water are sprayed evenly after seedling determination to prevent tall seedlings.

Early intertillage, weeding and seedling setting, early intertillage, frequent loosening, especially direct seeding rape in plate field, soil moisture is relatively high, soil hardening, weed damage is serious, soil between rows and plants should be hoed and loosened, and weeds should be removed. Before the low temperature comes, deep cultivation is carried out once, and the roots are cultivated, and the temperature is kept frostproof to promote the growth of rape roots. For fields with many weeds, 80mg of 20% Napujing can be used per mu, and 50kg of water can be sprayed on stems and leaves to eliminate weeds. 50ml of 12.5% Gaicaoneng emulsifiable concentrate can also be used per mu, and 50kg of water can be sprayed evenly on stems and leaves of weeds. The effect is better.

Early topdressing to promote seedling development on the basis of applying sufficient base fertilizer, generally after the full seedling early application of growth-promoting fertilizer, with 4 kg urea per mu of water splash; after each seedling thinning to apply appropriate fertilizer, with 5~10 loads of thin human and animal manure per mu splash; after the seedling is fixed once per mu topdressing fertilizer, with 10 loads of human and animal manure water splash. When applying nitrogen fertilizer, attention should also be paid to increasing phosphorus and potassium fertilizer. Generally, 20 kg of calcium superphosphate should be applied per mu. In mid-December, 20 loads of pig dung should be applied per mu as wax fertilizer to improve cold resistance. Topdressing is best applied in holes to reduce the volatile loss of fertilizer. Direct seeding rape needs more boron fertilizer and is sensitive to boron deficiency at seedling stage, so 0.5 kg borax fertilizer per mu can be applied to water spray after rape seedling setting.

Early bolting and early flowering of rape are easy to occur due to weak nutritional growth before winter. Control can be carried out according to the situation. One is to carry out deep cultivation on the fields with good growth and sufficient fertility, cut off part of the root system by 7~ 10cm near the rape roots, temporarily inhibit the growth, and apply appropriate nitrogen fertilizer when the rape begins to fall yellow. Second, heavy nitrogen fertilizer can be applied to rape with poor growth, which can effectively delay vegetative growth, increase vegetative growth and prevent early bolting. Third, for rape fields that may bolt before the year, timely picking bolts inhibits the top dominance of plants, so that nutrients are transferred from the trunk to the lower branches and delays the growth process. After bolting, 15~20 loads of human and animal manure water should be applied in time per mu, or 5 kg of urea should be poured on water to promote branching.